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// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <test/fuzz/fuzz.h>
#include <fs.h>
#include <netaddress.h>
#include <netbase.h>
#include <test/util/setup_common.h>
#include <util/check.h>
#include <util/sock.h>
#include <cstdint>
#include <exception>
#include <fstream>
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <tuple>
#include <unistd.h>
#include <vector>
const std::function<void(const std::string&)> G_TEST_LOG_FUN{};
/**
* A copy of the command line arguments that start with `--`.
* First `LLVMFuzzerInitialize()` is called, which saves the arguments to `g_args`.
* Later, depending on the fuzz test, `G_TEST_COMMAND_LINE_ARGUMENTS()` may be
* called by `BasicTestingSetup` constructor to fetch those arguments and store
* them in `BasicTestingSetup::m_node::args`.
*/
static std::vector<const char*> g_args;
static void SetArgs(int argc, char** argv) {
for (int i = 1; i < argc; ++i) {
// Only take into account arguments that start with `--`. The others are for the fuzz engine:
// `fuzz -runs=1 fuzz_seed_corpus/address_deserialize_v2 --checkaddrman=5`
if (strlen(argv[i]) > 2 && argv[i][0] == '-' && argv[i][1] == '-') {
g_args.push_back(argv[i]);
}
}
}
const std::function<std::vector<const char*>()> G_TEST_COMMAND_LINE_ARGUMENTS = []() {
return g_args;
};
std::map<std::string_view, std::tuple<TypeTestOneInput, TypeInitialize, TypeHidden>>& FuzzTargets()
{
static std::map<std::string_view, std::tuple<TypeTestOneInput, TypeInitialize, TypeHidden>> g_fuzz_targets;
return g_fuzz_targets;
}
void FuzzFrameworkRegisterTarget(std::string_view name, TypeTestOneInput target, TypeInitialize init, TypeHidden hidden)
{
const auto it_ins = FuzzTargets().try_emplace(name, std::move(target), std::move(init), hidden);
Assert(it_ins.second);
}
static TypeTestOneInput* g_test_one_input{nullptr};
void initialize()
{
// Terminate immediately if a fuzzing harness ever tries to create a TCP socket.
CreateSock = [](const CService&) -> std::unique_ptr<Sock> { std::terminate(); };
// Terminate immediately if a fuzzing harness ever tries to perform a DNS lookup.
g_dns_lookup = [](const std::string& name, bool allow_lookup) {
if (allow_lookup) {
std::terminate();
}
return WrappedGetAddrInfo(name, false);
};
bool should_abort{false};
if (std::getenv("PRINT_ALL_FUZZ_TARGETS_AND_ABORT")) {
for (const auto& t : FuzzTargets()) {
if (std::get<2>(t.second)) continue;
std::cout << t.first << std::endl;
}
should_abort = true;
}
if (const char* out_path = std::getenv("WRITE_ALL_FUZZ_TARGETS_AND_ABORT")) {
std::cout << "Writing all fuzz target names to '" << out_path << "'." << std::endl;
std::ofstream out_stream{out_path, std::ios::binary};
for (const auto& t : FuzzTargets()) {
if (std::get<2>(t.second)) continue;
out_stream << t.first << std::endl;
}
should_abort = true;
}
Assert(!should_abort);
std::string_view fuzz_target{Assert(std::getenv("FUZZ"))};
const auto it = FuzzTargets().find(fuzz_target);
Assert(it != FuzzTargets().end());
Assert(!g_test_one_input);
g_test_one_input = &std::get<0>(it->second);
std::get<1>(it->second)();
}
#if defined(PROVIDE_FUZZ_MAIN_FUNCTION)
static bool read_stdin(std::vector<uint8_t>& data)
{
uint8_t buffer[1024];
ssize_t length = 0;
while ((length = read(STDIN_FILENO, buffer, 1024)) > 0) {
data.insert(data.end(), buffer, buffer + length);
}
return length == 0;
}
#endif
// This function is used by libFuzzer
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
static const auto& test_one_input = *Assert(g_test_one_input);
test_one_input({data, size});
return 0;
}
// This function is used by libFuzzer
extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv)
{
SetArgs(*argc, *argv);
initialize();
return 0;
}
#if defined(PROVIDE_FUZZ_MAIN_FUNCTION)
int main(int argc, char** argv)
{
initialize();
static const auto& test_one_input = *Assert(g_test_one_input);
#ifdef __AFL_INIT
// Enable AFL deferred forkserver mode. Requires compilation using
// afl-clang-fast++. See fuzzing.md for details.
__AFL_INIT();
#endif
#ifdef __AFL_LOOP
// Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
// See fuzzing.md for details.
while (__AFL_LOOP(1000)) {
std::vector<uint8_t> buffer;
if (!read_stdin(buffer)) {
continue;
}
test_one_input(buffer);
}
#else
std::vector<uint8_t> buffer;
if (!read_stdin(buffer)) {
return 0;
}
test_one_input(buffer);
#endif
return 0;
}
#endif
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